Developed a core integration feature for the sopt-makers/sopt-playground-frontend repository by implementing a Cloudflare Pages function using TypeScript. This function rewrote incoming request hostnames to the accounts domain, enabling seamless integration with an external account service. By decoupling account management from the frontend, the solution improved security, maintainability, and scalability for authentication workflows. The approach established a reusable pattern for external service integration, focusing on clear domain boundaries and future extensibility. Work centered on API integration and frontend development, with a single, targeted commit delivering the feature. No bugs were addressed during this period, reflecting a focused engineering effort.